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Factors Controlling the Evolution of Mineral Assemblages and Illite Crystallinity on Paleozoic to Triassic Sequences from the Transition Between Maláguide and Alpujárride Complexes (Betic Cordillera, Spain): The Significance of Tobelite

Published online by Cambridge University Press:  01 January 2024

M. D. Ruiz Cruz  and
C. Sanz de Galdeano
M. D. Ruiz Cruz*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
C. Sanz de Galdeano
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, 18071-Granada, Spain
*
* E-mail address of corresponding author: mdruiz@uma.es
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Abstract

The Hercynian metamorphic event is poorly characterized in internal zone complexes of the Betic Cordillera (Spain), as it has been, to a great extent, overprinted by the mineral assemblages formed during the Alpine event. Identification of the signals of the Hercynian episode is easier in series largely unaffected by the Alpine event, such as Intermediate units between the Maláguide and the Alpujárride Complexes, which consist of a set of thrust slices. With the aim of characterizing the Hercynian paragenesis, a detailed comparison of the mineral assemblages of Paleozoic and overlying Triassic sequences, unaffected by the pre-Alpine event, was carried out. Mineral assemblages were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, electron microprobe, and transmission-analytical electron microscopy. A rapid increase in the illite crystallinity values was observed at the Triassic—Paleozoic transition in the upper tectonic slices. In addition, the diagenetic to anchizonal dickite-, sudoite-, and pyrophyllite-bearing assemblages, characterizing the Triassic rocks, contrast with Paleozoic assemblages consisting of white K-mica ± paragonite + chlorite + mica-chlorite and chlorite-vermiculite mixed layers + garnet, suggesting that this assemblage corresponds to the Hercynian metamorphic event. This assemblage records temperatures on the order of 400ºC and an intermediate pressure regime. Paleozoic rocks contain, in addition, tobelite, which comprises some of the detrital grains and strongly masks the illite crystallinity values. Tobelite has been identified only in the upper thrust slices, suggesting that changes in the detrital input is primarily responsible for the disappearance of tobelite at the transition from the Maláguide to the Alpujárride domain. Tobelite appears finely intergrown with white K-mica and its origin is uncertain. It could have been inherited as tobelite, but a more likely hypothesis is that the intergrowths of white K-mica and tobelite were formed at low temperature from an NH4-bearing mica precursor.

Keywords

Alpine MetamorphismAlpujárride ComplexBetic CordilleraHercynian MetamorphismMaláguide ComplexTobeliteWhite K-mica
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 4 , August 2010 , pp. 558 - 572
Copyright
Copyright © The Clay Minerals Society 2010

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References

Árkai, P., 1991 Chlorite crystallinity: an empirical approach and correlation with illite crystallinity, coal rank and mineral facies as exemplified by Palaeozoic and Mesozoic rocks of northeast Hungary Journal of Metamorphic Geology 9 723–734 10.1111/j.1525-1314.1991.tb00561.x.CrossRefGoogle Scholar
Árkai, P. Merriman, R.J. Roberts, B. Peacor, D.R. and Toth, M., 1996 Crystallinity, crystallite size and lattice strain of illite-muscovite and chlorite: comparison of XRD and TEM data for diagenetic and epizonal pelites European Journal of Mineralogy 8 1119–1137 10.1127/ejm/8/5/1119.CrossRefGoogle Scholar
Árkai, P. Livi, K.J.T. Frey, M. Brukner-Wein, A. and Sajgo, C., 2004 White micas with mixed interlayer occupancy: a possible cause of pitfalls in applying illite Kubler index (“crystallinity”) for the determination of metamorphic grade European Journal of Mineralogy 16 469–482 10.1127/0935-1221/2004/0016-0469.CrossRefGoogle Scholar
Azanón, J.M. García-Duenas, V. and Goffé, B., 1998 Exhumation of high-pressure metapelites and coeval crustal extension in the Alpujárride complex Tectonophysics 285 231–252 10.1016/S0040-1951(97)00273-4.CrossRefGoogle Scholar
Bobos, I. and Ghegari, L., 1999 Conversion of smectite to ammonium illite in the hydrothermal system of Harghita Bai, Romania: SEM and TEM investigations Geologica Carpathica 50 319–333.Google Scholar
Booth-Rea, G. Azanón, J.M. Goffé, B. Vidal, O. and Martínez-Martínez, J.M., 2002 High-pressure, low-temperature metamorphism in Alpujárride Units of southeastern Betics (Spain) Comptes Rendues, Geosciences 334-11 857–865 10.1016/S1631-0713(02)01787-X.CrossRefGoogle Scholar
Cliff, G. and Lorimer, G.W., 1975 The quantitative analysis of thin specimen Journal of Microscopy 103 203–207 10.1111/j.1365-2818.1975.tb03895.x.CrossRefGoogle Scholar
Daniels, E.J. and Altaner, S.P., 1990 Clay mineral authigen-esis in coal and shale from the Anthracite region, Pennsylvania American Mineralogist 75 825–839.Google Scholar
Drits, V.A. Lindgreen, H. and Salyn, A.L., 1997 Determination of the content and distribution of fixed ammonium in Illite-smectite by X-ray diffraction: Application to North See Illite-smectite American Mineralogist 82 79–87 10.2138/am-1997-1-210.CrossRefGoogle Scholar
Egeler, C.G. and Simon, O.J., 1969 Orogenic evolution of the Betic Zone (Betic Cordilleras, Spain), with emphasis on the nappe structures Geologie en Mijnbouw 48 296–305.Google Scholar
Felder, T.E., 1980 Geologic evolution of the westernmost part of the Internal Betic Zone (Betic Cordilleras, Southern Spain) Geologische Rundschau 69 131–148 10.1007/BF01869028.CrossRefGoogle Scholar
Frey, M. and Frey, M., 1987 Very low-grade metamorphism of clastic sedimentary rocks Low Temperature Metamorphism Glasgow, UK Blackie and Sons Ltd.Google Scholar
Ganguly, J. and Saxena, S.K., 1984 Mixing properties of aluminosilicate garnets: constraints from natural and experimental data, and applications to geothermobarometry American Mineralogist 69 88–97.Google Scholar
Goffé, B. Michard, A. García-Duenas, V. González-Lodeiro, F. Monié, P. Campos, J. Galindo-Zaldívar, J. Jabaloy, A. Martínez-Martínez, J.M. and Simancas, F., 1989 First evidence of high-pressure, low temperature metamorphism in the Alpujarride nappes, Betic Cordillera (SE Spain) European Journal of Mineralogy 1 139–142 10.1127/ejm/01/1/0139.CrossRefGoogle Scholar
Guidotti, C.V. and Sassi, F.P., 1976 Muscovite as a petrogenetic indicator mineral in pelitic schist Neues Jahrbuch fu¨r Mineralogie Abhandlungen 127 97–142.Google Scholar
Higashi, S., 1982 Tobelite, a new ammonium dioctahedral mica Mineralogical Journal 11 138–146 10.2465/minerj.11.138.CrossRefGoogle Scholar
Hodges, K.V. and Spear, F.S., 1982 Geothermometry, geobarometry and the Al2SiO5 triple point at Mt. Moosilauke, New Hampshire American Mineralogist 67 1118–1134.Google Scholar
Hoinkes, G., 1986 Effect of grossular content in garnet on the partitioning of Fe and Mg between garnet and biotite Contributions to Mineralogy and Petrology 92 393–399 10.1007/BF00572168.CrossRefGoogle Scholar
Hynes, A. and Forest, R.C., 1988 Empirical garnet-muscovite geothermometry in low-grade metapelites, Selwyn Range (Canadian Rockies) Journal of Metamorphic Geology 6 297–309 10.1111/j.1525-1314.1988.tb00422.x.CrossRefGoogle Scholar
Juster, T.C. Brown, P.E. and Bailey, S.W., 1987 NH4-bearing illite in very low grade metamorphic rocks associated with coal, northeastern Pennsylvania American Mineralogist 72 555–565.Google Scholar
Kisch, H.J., 1991 Illite crystallinity; recommendations on sample preparation, X-ray diffraction settings, and inter-laboratory samples Journal of Metamorphic Geology 9 665–670 10.1111/j.1525-1314.1991.tb00556.x.CrossRefGoogle Scholar
Kretz, R., 1983 Symbols for rock-forming minerals American Mineralogist 68 277–279.Google Scholar
Krogh, E.J. and Rahein, A., 1978 Temperature and pressure dependence of Fe-Mg partitioning between garnet and phengite, with particular reference to eclogites Contributions to Mineralogy and Petrology 66 75–80 10.1007/BF00376087.CrossRefGoogle Scholar
Kubler, B., 1968 Evaluation quantitative du métamorphisme par la cristallinité de l’illite. Etat des progrès réalisés ces dernières années Bulletin Centre Recherche Pau, S.N.P.A. 2 385–397.Google Scholar
Liu, Q. Zhang, P. Dings, S. Lin, X. and Zheng, N., 1996 NH4-illite in Permo-Carboniferous coal-bearing strata, North China Chinese Science Bulletin 41 1458–1461.Google Scholar
Makel, G.H. (1985) The geology of the Maláguide complex and its bearing on the geodynamic evolution of the Betic-Rif orogen (Southern Spain and Northern Morocco). GUA Papers of Geology, 22. 263 pp.Google Scholar
Makel, G.H. and Rondeel, H.E., 1979 Differences in stratigraphy and metamorphism between superposed Maláguide and Alpujarride units in the Espuna area (Betic Cordilleras, Spain) Estudios Geológicos 35 109–117.Google Scholar
Maresch, W.V. Massone, H.-J. and Czank, M., 1985 Ordered and disordered chlorite/biotite interstratifications as alteration products of chlorite Neues Jahrbuch fu¨r Mineralogie Abhadlungen 152 79–100.Google Scholar
Merriman, R.J. Peacor, D.R., Frey, M. Robinson, D., 1999 Very low-grade metapelites: mineralogy, microfabrics and measuring reaction progress Low-grade Metamorphism Oxford, UK Blackwell Science 10–60.Google Scholar
Merriman, R.J. Roberts, B. and Peacor, D.R., 1990 A transmission electron microscope study of white mica crystallite size distribution in a mudstone to slate transitional sequence, North Wales, U.K Contributions to Mineralogy and Petrology 106 27–40 10.1007/BF00306406.CrossRefGoogle Scholar
Merriman, R.J. Roberts, B. Peacor, D.R. and Hirons, S.R., 1995 Strain-related differences in the crystal growth of white mica and chlorite: a TEM and XRD study of the development of metapelite microfabrics in the Southern Uplands thrust terrane, Scotland Journal of Metamorphic Geology 13 559–576 10.1111/j.1525-1314.1995.tb00243.x.CrossRefGoogle Scholar
Nieto, F., 2002 Characterization of coexisting NH4- and K-micas in very low-grade metapelites American Mineralogist 87 205–216 10.2138/am-2002-2-302.CrossRefGoogle Scholar
Paquet, J., 1969 Etude géologique de l’Ouest de la province de Murcie Bulletin de la Societé géologique de France 111 1–270.Google Scholar
Ruiz Cruz, M.D., 1997 Very low-grade chlorite with anomalous chemistry and optical properties from the Maláguide Complex, Betic Cordilleras, Spain The Canadian Mineralogist 35 923–935.Google Scholar
Ruiz Cruz, M.D., 2001 Mixed-layer mica-chlorite in very low-grade metaclastites from the Maláguide Complex (Betic Cordilleras, Spain) Clay Minerals 36 307–324 10.1180/000985501750539418.CrossRefGoogle Scholar
Ruiz Cruz, M.D. and Rodríguez Jimenez, P., 2002 Correlation between crystallochemical parameters of phyllosilicates and mineral facies in very low-grade metasediments of the Betic Cordillera (Spain): A synthesis Clay Minerals 37 169–185 10.1180/0009855023710026.CrossRefGoogle Scholar
Ruiz Cruz, M.D. and Nieto, J.M., 2006 Chemical and structural evolution of “metamorphic vermiculite” in metaclastic rocks of the Betic Cordillera, Malaga, Spain: A synthesis The Canadian Mineralogist 44 249–265 10.2113/gscanmin.44.1.249.CrossRefGoogle Scholar
Ruiz Cruz, M.D. Sanz de Galdeano, C. and Lázaro, C., 2005 Metamorphic evolution of Triassic rocks from the transition zone between the Maláguide and the Alpujarride complexes (Betic Cordilleras, Spain) European Journal of Mineralogy 17 81–91 10.1127/0935-1221/2005/0017-0081.CrossRefGoogle Scholar
Sanz de Galdeano, C. Andreo, B. García-Tortosa, F.J. and Lopez-Garrido, A.C., 2001 The Triassic palaeogeographic transition between the Alpujarride and Maláguide complexes. Betic-Rif Internal Zone Palaeo 167 157–173 10.1016/S0031-0182(00)00236-4.CrossRefGoogle Scholar
Shigorova, T.A. Kotov, NV K YeN Shamakin, B.M. and Frank-Kamenetski, V.A., 1981 Synthesis, diffractometry and IR spectroscopy of micas in the series from muscovite to the ammonium analog Geochemistry International 18 76–82.Google Scholar
Vedder, W., 1965 Ammonium in muscovite Geochimica et Cosmochimica Acta 29 221–228 10.1016/0016-7037(65)90019-0.CrossRefGoogle Scholar
Velde, B., 1978 High temperature or metamorphic vermicu-lites Contributions to Mineralogy and Petrology 66 319–323 10.1007/BF00373416.CrossRefGoogle Scholar
Vidal, O. Goffé, B. Bousquet, R. and Parra, T., 1999 Calibration and testing of an empirical chloritoid-chlorite Mg-Fe exchange thermometer and thermodynamic data for daphnite Journal of Metamorphic Geology 17 25–39 10.1046/j.1525-1314.1999.00174.x.CrossRefGoogle Scholar
Ward, C.R. and Christie, P.J., 1994 Clays and other minerals in coal seams of the Moura-Baralaba area, Bowen Basin, Australia International Journal of Coal Geology 25 287–309 10.1016/0166-5162(94)90020-5.CrossRefGoogle Scholar
Warr, L.C. and Rice, H.N., 1994 Interlaboratory standariza-tion and calibration of clay minerals crystallinity and crystallite size data Journal of Metamorphic Geology 12 141–152 10.1111/j.1525-1314.1994.tb00010.x.CrossRefGoogle Scholar
Wilson, P.N. Parry, W.T. and Nash, W.P., 1992 Characterization of hydrothermal tobelitic veins from black shales, Oquirrthe Mountains, Utah Clays and Clay Minerals 40 405–420 10.1346/CCMN.1992.0400405.CrossRefGoogle Scholar
Zeck, H.P. and Whitehouse, M.J., 1999 Hercynian, Pan-African, Proterozoic and Archean ion-microprobe zircon ages for a Betic-Rif core complex, Alpine belt, W Mediterranean — consequences for its P-T-t path Contributions to Mineralogy and Petrology 134 134–149 10.1007/s004100050474.CrossRefGoogle Scholar